When I first received them I thought they were a bit flimsy. and I wouldn't use the stainless steel lids that come with it. Instead, over the past few months, I've found the mechanism to be far more reliable than I once thought. As you step out of the hot liquid and let it cool, a vacuum is created, but you can break this by pressing on the round steel ball on top of the center foot that the lid slides on. I hit it on another heavy glass and there was no scratch or crack on the jar. I've done this a few times because I don't look in the fridge at night for fear of burning my calluses. This happens every other night and has never resulted in an impromptu search for towels. They're cheap and very large, making them ideal for packaging other brands of Crystal Light or jug-sized drinks.
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